I have been having a problem to connect to internet at home from my recently purchased laptop, and would highly appreciate your advices/suggestions.
Here is my situation:
My new laptop is HP 550, intel core duo, 32-bit, Windows Vista Business, service pack 1. I am using a wired ADSL connection. I use TCP/IPv4, with “obtain an IP address automatically” setting. Because a fixed IP address is needed for my work, I use a free software called NetSetMan to switch the IP address each time when I am in office or at home. For antivirus software, I use Avira AntiVir Premium.
I did the initial setup at home, but at that time, there was no problem to connect to internet at home.
Then, suddenly one day, I could not connect it to internet, so I started investigation. I use a standard LAN cable. This is not a problem with my cable or the provider because I have no problem to connect my old laptop (Windows XP) to internet. The TCP/IP setting is exactly the same in both computers. Even if I close the Avira AntiVir Premium completely (from Task Manager, I close the process, etc.), still no internet connection is available so I think it’s also not a problem caused by my antivirus software. It says “Unidentified new work, Local only”.
Afterwards, I tested the internet connection in office. In office, it is always no problem, so the computer itself is ok. I think it’s a problem connected with Windows Vista, maybe.
Back at home, following my friend's suggestion, I disabled Windows Firewall. Then, the problem was solved.
But, when I started the computer again, I could not connect to internet although the Windows Firewall was disabled.
When I switch the IP setting to office configuration, and then back to home configuration by using NetSetMan, the internet connection is usually back, but only for about 5 seconds, then it cannot connect to internet again.
Following advices I found on internet,
* I already disabled TCP/IPv6, but the problem is not solved.
* I already did Device Manager => Network adapters => Intel(R) 82562GT 10/100 Network Connection => Properties => Power Management => Check off “Allow the computer to turn off this device to save power.”, but the problem is not solved.
* I also did this (
http://support.microsoft.com/?scid=kb%3Ben-us%3B928233&x=11&y=13), but the problem is not solved.
Here are some additional information
* Even when the internet connection is impossible, it is possible to access other PCs in the network (local network can be accessed).
* When I ping to
www.google.com and
www.yahoo.com, it shows IP address (DNS working?), but it times out because there is no reply coming.
* When I do ipconfig /all, it shows 2 DNS servers, but the top one is 0.0.0.0.
* When I access the ADSL modem, the physical address (MAC) is registered.
I would infinitely appreciate your help.